Promoting your URL or Twitter account is substantially different than substituting QR codes for needed information. While the relentless domination of smart phones seems inevitable, at this moment they are not universal. This means you are giving the majority of your audience the distinct sense of "being left out" -- not a winning strategy.

Earlier this week, I wrote a blog post titled QR codes deliver buyers in real time. In comments on the post as well as via Twitter, Facebook, and Google+ a few people mentioned that QR codes are not very popular. In fact, some said that many people don’t even know what they are or how to use them...